Webcam not working on Sony Vaio laptop?

I have a Sony Vaio NS20ES had it for about a year or so now, and the webcam has stopped working, It just doesn’t seem to detect it, the green light next to the built in webcam comes on (to say that the webcam is on) but its not…

I have Arcsoft webcam companion installed on the laptop as it came with it, and it doesn’t work on that, nor skype, or msn, nothing! please help x